/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project 
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may 
 *    appear in the software itself, if and wherever such third-party 
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
 *    or promote products derived from this software without prior 
 *    written permission. For written permission, please contact 
 *    license@jpos.org.
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package com.nasoft.util;

import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

/**
 * Simple Profiler
 * 
 * @author Alejandro P. Revilla
 * @version $Id: Profiler.java,v 1.2 2003/05/16 04:11:04 alwyns Exp $
 */
public class Profiler implements Loggeable
{
  long       start, parcial;
  Collection events;

  public Profiler()
  {
    super();
    reset();
  }

  /**
   * reset timers
   */
  public void reset()
  {
    start = parcial = System.currentTimeMillis();
    events = new ArrayList();
  }

  /**
   * mark checkpoint
   * 
   * @param detail
   *          checkpoint information
   */
  public void checkPoint(String detail)
  {
    long now = System.currentTimeMillis();
    events.add(detail + " [" + Long.toString(now - parcial) + "]");
    parcial = now;
  }

  /**
   * @return total elapsed time since last reset
   */
  public long getElapsed()
  {
    return System.currentTimeMillis() - start;
  }

  /**
   * @return parcial elapsed time since last reset
   */
  public long getParcial()
  {
    return System.currentTimeMillis() - parcial;
  }

  public void dump(PrintStream p, String indent)
  {
    String inner = indent + "  ";
    parcial = start;
    checkPoint("end");
    Iterator iter = events.iterator();
    p.println(indent + "<profiler>");
    while (iter.hasNext())
      p.println(inner + (String) iter.next());

    p.println(indent + "</profiler>");
  }
}
